Power Switch To turn the UPS on, press the power button for approximately 2 seconds - you will hear a constant tone (1 second) - and release after a short beep. To turn the UPS off, press the power button for approximately 2 seconds - you will hear a constant tone (1 second) - and release after two short beeps. Alarm setting: The audible alarm can be turned OFF or ON by quickly pressing the POWER button twice. The default setting is for the Alarm On. To turn the Alarm Off, quickly press the power button twice. You will hear two short beeps when the Alarm is turned Off. To turn the Alarm back ON, quickly press the power button twice. You will hear a single short beep when the Alarm is turned On. *When the Alarm is turned Off, there will be no audible notification when the UPS reaches a low battery state. 2. Power On Indicator This LED is illuminated when the utility power is normal and the UPS outlets are providing power, free of surges and spikes.